第3题:[单选题]接口板主备方式下,将主备板分别连接到一个三层交换机或路由器,三层交换机或路由器启用( )协议。
When the interface board works in active/standby mode, we need to connect active/standby boards to one 3-layer switch or router respectively. The 3-laye switch or router uses the ( ) protocol. A.BFD B.VRF C.VRRP D.OSPF 参考答案:C